2. People on foot cm go across the road when ___

A.the traffic lights are green B.they look to the right

C.the road is clear                 D.the traffic stopped

3.When you go by bus in England, you must be careful because___

A.you may go the wrong way             B.there are too many buses there

C.there are big buses with two floors   D.you will lost without bus

4.Some people enjoy sitting on the second floor of a big bus because___

A.it is no danger

B.there are fewer people there

C.they can have a better view of the city

D.it is free（不收费的）